Registrar upgrade to MySQL 5.7 (openedx-unsupported#619)

* Connect registrar to mysql5.7 database

* Add scripts to allow provisioning with mysql5.7

docker-compose.yml

@@ -320,15 +320,15 @@ services:
     depends_on:
       - discovery
       - lms
-      - mysql
+      - mysql57
       - memcached
       - redis
       - registrar-worker
     # Allows attachment to the registrar service using 'docker attach <containerID>'.
     stdin_open: true
     tty: true
     environment:
-      DB_HOST: edx.devstack.mysql
+      DB_HOST: edx.devstack.mysql57
       DB_NAME: registrar
       DB_PORT: 3306
       DB_USER: registrar001
@@ -358,12 +358,12 @@ services:
     hostname: registrar-worker.devstack.edx
     depends_on:
       - lms
-      - mysql
+      - mysql57
       - redis
     stdin_open: true
     tty: true
     environment:
-      DB_HOST: edx.devstack.mysql
+      DB_HOST: edx.devstack.mysql57
       DB_NAME: registrar
       DB_PORT: 3306
       DB_USER: registrar001

provision.sh

@@ -140,6 +140,14 @@ do
   sleep 1
 done
 
+# Ensure the MySQL 5.7 server is online and usable
+echo "${GREEN}Waiting for MySQL 5.7.${NC}"
+until docker-compose exec -T mysql57 bash -c "mysql -uroot -se \"SELECT EXISTS(SELECT 1 FROM mysql.user WHERE user = 'root')\"" &> /dev/null
+do
+  printf "."
+  sleep 1
+done
+
 # In the event of a fresh MySQL container, wait a few seconds for the server to restart
 # See https://github.com/docker-library/mysql/issues/245 for why this is necessary.
 sleep 20
@@ -150,6 +158,11 @@ echo -e "${GREEN}MySQL ready.${NC}"
 echo -e "${GREEN}Ensuring MySQL databases and users exist...${NC}"
 docker-compose exec -T mysql bash -c "mysql -uroot mysql" < provision.sql
 
+# Ensure that the MySQL 5.7 databases and users are created for all IDAs.
+# (A no-op for databases and users that already exist).
+echo -e "${GREEN}Ensuring MySQL 5.7 databases and users exist...${NC}"
+docker-compose exec -T mysql57 bash -c "mysql -uroot mysql" < provision.sql
+
 # If necessary, ensure the MongoDB server is online and usable
 # and create its users.
 if needs_mongo "$to_provision_ordered"; then